Hmm so it generates
<img
src="//xxx/optimized/3X/2/2/guid_1_521x500.png"
alt="image"
width="521"
height="500"
srcset="//xxx/optimized/3X/2/2/guid_1_521x500.png,
//xxx/optimized/3X/2/2/guid_1_781x750.png 1.5x,
//xxx/optimized/3X/2/2/guid_1_1042x1000.png 2.0x"
>
I noticed the srcset URLs in the output sometimes start with // and sometimes https:// .. is that intentional?
It looks like you can use 2x instead of 2.0x to save two bytes there, per the documentation on srcset.